Earlier when I was trying to mine, I ran either siac or siad I can't remember and my balance went to 0 and I got a new address. I quit terminal and restarted electrum and my balance and address was back again. I didn't try to mine again because I was worried I'd permanently mess up but maybe that has something to do with what happened now.
I think when you are mining you get an new address whenever you mine coins. It is ok to have multiple addresses in the same wallet. but I am not a miner and hope that some miners can confirm this.